ABM3B-24.000MHZ-B2-T - 24MHz 18pF 50Ω SMD Crystal | Abracon
부품 번호: ABM3B-24.000MHZ-B2-T ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $0.46 | $0.46 |
| 10 | $0.42 | $4.20 |
| 100 | $0.36 | $36.00 |
| 500 | $0.31 | $155.00 |
| 1,000 | $0.27 | $270.00 |
ABM3B-24.000MHZ-B2-T 개요
A quartz crystal is a passive electromechanical resonator that exploits the piezoelectric effect of an AT-cut quartz blank to produce a stable reference frequency. Crystals belong to the broader category of frequency-control devices, which also includes MEMS oscillators, ceramic resonators, and SAW resonators. The role of a crystal in a system hierarchy is to provide a low-jitter, low-phase-noise clock reference for downstream frequency-control and timing ICs, synthesizers, and microcontrollers. The ABM3B-24.000MHZ-B2-T is a fundamental-mode, AT-cut crystal — a topology that minimizes cost and maximizes aging performance for frequencies up to about 50 MHz.
Key features that distinguish this part include its compact 5.0 x 3.2 mm industry-standard footprint, 50 Ω ESR that eases oscillator startup margin, and 18 pF load capacitance compatible with common low-power CMOS oscillator stages. The Pb-in-glass hermetic seal eliminates risk of moisture ingress during reflow and field operation, and the part is RoHS compliant. Frequency tolerance of ±20 ppm at 25 °C and stability of ±50 ppm over temperature make it suitable for consumer USB, industrial PLC, and embedded microcontroller designs.
Technically, the ABM3B uses a strip-fundamental AT-cut quartz blank operating at 24 MHz on its fundamental mode. The combination of low ESR (50 Ω max) and moderate motional capacitance allows wide-margin oscillation with standard Pierce oscillator circuits using standard 18 pF external load capacitors. Compared with 3rd-overtone parts, the fundamental-mode topology eliminates the need for a tank circuit and avoids the higher ESR typically seen at the 3rd OT, simplifying oscillator design.
Typical applications include USB 2.0 full-speed reference clocks, microcontroller clock inputs on STM32 and PIC platforms, industrial CAN/RS-485 node timing, consumer audio ADC/DAC master clocks, and PLC logic-controller clock trees. The 50 Ω ESR and 18 pF load make it a general-purpose drop-in for any 24 MHz reference design.
When designing with this part, ensure PCB pad pattern matches the 5.0 x 3.2 mm four-pad SMD land recommended in the ABM3B datasheet, and verify that the load capacitance of the surrounding Pierce oscillator (PCB stray + external caps) is close to 18 pF to keep ppm error low. Decoupling and ground integrity on the oscillator pins directly impact phase-noise performance.
This page synthesizes distributor pricing, drop-in compatible alternatives, and practical layout guidance that the bare manufacturer datasheet does not consolidate in one place.
드롭인 대체품: ABM3B-24.000MHZ-B2-T — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ABM3B-24.000MHZ-B-4-Y-T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ECS-240-18-5PX-TR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
XRCGB24M000F2P00R0
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ABM3B-24.000MHZ-B2-T
✅ 드롭인✓ 재고 있음
$0.27 / 개
데이터시트 보기 →ABM3B-24.000MHZ-B2-T 사양
| Manufacturer | Abracon |
| Series | ABM3B |
| Frequency | 24.000 MHz |
| Frequency Tolerance | ±20 ppm |
| Frequency Stability | ±50 ppm |
| Load Capacitance | 18 pF |
| Equivalent Series Resistance (ESR) | 50 Ω |
| Operating Mode | Fundamental |
| Cut Type | AT-cut |
| 동작 온도 | -40 °C to +85 °C |
| 패키지 / 케이스 | 4-SMD, No Lead (5.0 x 3.2 x 1.1 mm) |
| 실장 유형 | Surface Mount |
| Termination Style | Solder Pad |
| Hermetic Seal | Yes (Pb in glass) |
| Reflow Capability | Yes (IR reflow compatible) |
| RoHS 상태 | Compliant |
| Part Status | Active |
ABM3B-24.000MHZ-B2-T 핀 구성
| 핀 1 | Crystal Pin 1 — Crystal terminal connected to MCU/IC OSC_IN or OSC_OUT (per ABM3B datasheet) |
| 핀 2 | Case Ground — Case/ground pad — tie to PCB ground for mechanical stability and noise reduction |
| 핀 3 | Crystal Pin 2 — Crystal terminal paired with pin 1 to form the resonator |
| 핀 4 | Case Ground — Case/ground pad — tie to PCB ground |
일반적인 애플리케이션
ABM3B-24.000MHZ-B2-T 적합 용도: 7 애플리케이션s: USB 2.0 Reference Clock, Microcontroller Clock Reference, Industrial CAN / RS-485 Node Timing, Consumer Audio CODEC Master Clock, PLC Logic Controller Clock Tree, IoT Sensor Node Timekeeping, Embedded Serial Peripherals and Display Controllers.
USB 2.0 Reference Clock
The ABM3B-24.000MHZ-B2-T serves as the 24 MHz reference resonator for USB 2.0 full-speed transceivers in MCU peripherals and dedicated USB controllers. Per USB 2.0 spec, the device clock must be accurate to within ±2500 ppm; the ABM3B's ±20 ppm tolerance at 25 °C and ±50 ppm stability over -40 °C to +85 °C provide more than 50× margin against this spec. The 50 Ω ESR is comfortably within the startup-margin budget of typical USB-PHY Pierce oscillator stages. Placed between the MCU's OSC_IN/OSC_OUT pins with two 33 pF external caps to ground, the ABM3B yields a stable reference for downstream PLL multiplication to 480 MHz USB high-speed. Compared to a MEMS oscillator, the quartz crystal adds zero active current and has lower phase noise near the carrier — both useful for EMI compliance.
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Microcontroller Clock Reference
Generic MCU applications use the ABM3B-24.000MHZ-B2-T as the system clock reference for STM32, PIC, AVR, and MSP430 microcontrollers whose datasheet specifies a 24 MHz external crystal. The ±20 ppm tolerance combined with 18 pF load makes it a near-ideal match for the MCU's internal Pierce oscillator gain stage, eliminating any need for an external clock driver. With 50 Ω ESR, the negative-resistance margin is preserved even with long PCB traces or high stray capacitance. The 5.0 x 3.2 mm footprint is widely supported across MCU reference designs, and the -40 °C to +85 °C industrial operating range suits outdoor enclosures. Engineers should verify the total effective load (two external caps plus PCB stray) is within ±2 pF of the 18 pF rating to maintain frequency accuracy across production.
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Industrial CAN / RS-485 Node Timing
In industrial CAN and RS-485 communication nodes, the ABM3B-24.000MHZ-B2-T provides the 24 MHz timing base that the MCU's internal PLL multiplies to higher baud-rate clocks. CAN-FD bit-rate accuracy requires ±0.5% oscillator tolerance, which the ABM3B's ±50 ppm easily satisfies with 10× margin. The 5.0 x 3.2 mm package suits factory-automation enclosures with vibration exposure, and the Pb-in-glass hermetic seal protects against humidity ingress in outdoor cabinets. The 50 Ω ESR combined with typical 18 pF load allows design reuse across CAN, RS-485, and Modbus node variants without redesign. Compared to a MEMS oscillator at the same frequency, the quartz crystal provides tighter jitter performance and improved electromagnetic-compatibility behavior on long bus cables.
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Consumer Audio CODEC Master Clock
Audio CODEC master-clock inputs running at 24 MHz benefit from the ABM3B-24.000MHZ-B2-T's low jitter and tight tolerance. Audio master-clock jitter directly modulates onto the DAC output spectrum, raising the noise floor and degrading dynamic range — the ABM3B's AT-cut fundamental-mode topology yields lower close-to-carrier phase noise than 3rd-overtone or fundamental-mode parts with weaker ESR. The 18 pF load is compatible with common CODEC oscillator stages from Cirrus Logic, AKM, and TI. Over the -10 °C to +70 °C consumer operating window, the ±50 ppm stability holds frequency without audible pitch drift in sampling-rate-conversion paths. The 5.0 x 3.2 mm footprint fits standard consumer audio board layouts next to headphone-amp ICs.
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PLC Logic Controller Clock Tree
PLC logic controllers use the ABM3B-24.000MHZ-B2-T as the master reference clock feeding the MCU's PLL block, which then distributes phase-aligned clocks to digital I/O scan engines and analog ADC sample-and-hold logic. The ±20 ppm initial tolerance plus ±50 ppm drift over -40 °C to +85 °C ensures deterministic scan-cycle timing for ladder-logic execution. The 50 Ω ESR supports reliable startup even with the longer PCB traces typical of PLC backplane designs. The ceramic SMD package with Pb-in-glass seal withstands the wave-solder rework occasionally required in industrial-channel board repairs. The part's RoHS compliance supports modern PLC designs targeting IEC 61131-3 compliance and EU industrial-environment directives.
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IoT Sensor Node Timekeeping
Low-power IoT sensor nodes use the ABM3B-24.000MHZ-B2-T as the high-frequency reference that the MCU uses briefly to time-stamp sensor readings, then returns to a 32 kHz low-power crystal for sleep-mode timekeeping. The ABM3B's 50 Ω ESR and 18 pF load are compatible with most sub-GHz radio and BLE SoCs that expect a 24 MHz reference for radio PLL calibration. The 5.0 x 3.2 mm footprint suits compact sensor housings, and the industrial -40 °C to +85 °C range supports outdoor environmental-sensor deployments. Compared to an integrated MEMS oscillator, the discrete quartz crystal provides lower phase noise and tighter frequency tolerance — both important when calibrating narrow-band radio channels in dense IoT networks.
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Embedded Serial Peripherals and Display Controllers
Display controllers and serial peripherals such as SPI-bus expanders use the ABM3B-24.000MHZ-B2-T as the local timing reference for TFT-LCD timing generation and SPI clock-rate derivation. The 24 MHz fundamental mode allows integer division to common pixel-clock and SPI rates without residual ppm error beyond the crystal's own ±20 ppm tolerance. The 5.0 x 3.2 mm SMD footprint fits next to connector pins and FPC pads. The Pb-in-glass seal and IR-reflow capability support standard SMT production. With 50 Ω ESR and 18 pF load, this crystal provides stable startup across temperature for TFT bias-supply timing and backlight-PWM frequency generation. It is a cost-effective choice when sub-ppm stability is unnecessary.
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추천 제품 요약
엔지니어링 참조 데이터: ABM3B-24.000MHZ-B2-T — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ABM3B-24.000MHZ-B-4-Y-T | ABM3-24.000MHZ-B2-T | ECS-240-18-5PX-TR | XRCGB24M000F2P00R0 |
|---|---|---|---|---|---|
| Brand | Abracon | Abracon | Abracon | ECS Inc. | Murata |
| Package | 4-SMD 5.0 x 3.2 mm | 4-SMD 5.0 x 3.2 mm — same | 4-SMD 3.2 x 2.5 mm — smaller | 4-SMD 5.0 x 3.2 mm — same | 4-SMD 5.0 x 3.2 mm — same |
| Frequency | 24.000 MHz | 24.000 MHz | 24.000 MHz | 24.000 MHz | 24.000 MHz |
| Frequency Tolerance | ±20 ppm | ±30 ppm | ±20 ppm | ±30 ppm | ±20 ppm |
| Frequency Stability | ±50 ppm | ±50 ppm | ±50 ppm | ±50 ppm | ±25 ppm |
| Load Capacitance | 18 pF | 18 pF | 18 pF | 18 pF | 8 pF |
| ESR | 50 Ω | 50 Ω | 60 Ω (higher) | 50 Ω | 60 Ω |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Operating Mode | Fundamental | Fundamental | Fundamental | Fundamental | Fundamental |
주요 차별점
- Wider operating-temperature envelope than typical consumer crystals (vs ECS-240-18-5PX-TR)
- Lower ESR on the 5.0x3.2 mm footprint than the smaller ABM3 (vs ABM3-24.000MHZ-B2-T)
- Industry-standard 18 pF load matches MCU reference designs (vs XRCGB24M000F2P00R0)
설계 노트
Place the ABM3B-24.000MHZ-B2-T as close as physically possible to the MCU's OSC_IN and OSC_OUT pins to minimize trace stray capacitance and reduce EMI pickup. The four-pad SMD footprint uses pads 1 and 3 as the crystal terminals and pads 2 and 4 as case ground — tie pads 2 and 4 to a low-impedance ground plane beneath the part. Keep digital signal traces away from the crystal pins to avoid injecting noise into the oscillator loop. A guard ring around the crystal connected to ground further isolates the resonator from adjacent switching signals.
Do not select external load capacitors arbitrarily. The ABM3B-24.000MHZ-B2-T is specified at 18 pF load; the two external caps plus PCB stray (typically 2–5 pF) must combine to 18 pF. A common error is using 22 pF caps which yields CL ~ 12–13 pF and pulls the oscillator off-frequency by tens of ppm. Use NPO/C0G ceramic capacitors (not X7R) to maintain low-loss and stable loading across temperature. Verify actual oscillator frequency with a frequency counter on first prototypes — calculate ppm error as (f_measured - 24,000,000) / 24 ppm.
Although ABM3B-24.000MHZ-B2-T is a passive resonator and not an EMI source, the oscillator loop including the MCU's internal inverter is sensitive to nearby fast edges. Route USB differential pairs, RF traces, and high-current switching traces at least 5 mm away from the crystal. Place a small ferrite bead or 10 Ω resistor in series with the MCU's power pin near the oscillator section if the oscillator shows supply-noise modulation on the output spectrum. The 50 Ω ESR combined with typical Pierce oscillator gain provides adequate startup margin under clean supply conditions.
규정 준수 정보
RoHS compliant per Abracon product page. Quartz crystals are not subject to AEC-Q100 qualification (passive component). Pb-in-glass seal is hermetic and exempt from RoHS lead-phasing under current IEC directives.